DCist has the story -- Wonderland hosts a free local stand-up night on Sundays, and after 16 other comedians, Buress walked up unannounced. He did a 40 minute set on politics, kids, social media and more. They report that before his surprise set, he was sitting at the bar next to a lady who knew who he was but didn't say anything, instead tweeting about him sitting there. Pretty funny and weird.

He tweeted about the set just before it happened, but later deleted the tweet.